external hdd not working after using in an old xp comp

hi,
I have a buffalo 500gb external hdd. It used to work fine until one day my friend connected it to his old xp comp. It didnt recognise in his comp and when we tried it back in my win 7 comp, it just shows a extra drive in my computer window but with no details or name and I cannot open/ use it. I need help.
Lots of important stuff in there. :(
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More about external hdd working comp
  1. Can you try another USB cable for connecting the drive to your PC?
  2. not happening
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